package com.sky.service.impl;

import ch.qos.logback.core.status.StatusUtil;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;


@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setMealDishMapper;
    @Autowired
    private DishMapper dishMapper;


    /*
     * 新增套餐，同时保留套餐和菜品之间的关系
     * */
    @Transactional  //添加为事务
    @Override
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //向套餐中加入数据
        setmealMapper.insert(setmeal);

        //获取生成的id
        Long setmealId = setmeal.getId();

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            // 设置套餐的id
            setmealDish.setSetmealId(setmealId);
        });

        System.out.println(setmealDishes+"_------------------------------------");

        //保存套餐和菜品的关联关系
        setMealDishMapper.insertBatch(setmealDishes);
    }


    /*
     *   分页查询
     * */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        int pageNum = setmealPageQueryDTO.getPage();    //页数
        int pageSize = setmealPageQueryDTO.getPageSize();   //一页几条数据

        PageHelper.startPage(pageNum,pageSize);
        Page<SetmealVO> page=setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /*
    *  批量删除套餐
    * */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        ids.forEach(id->{
            Setmeal setmeal=setmealMapper.getById(id);
            if(StatusConstant.ENABLE==setmeal.getStatus()){
                //起售中的套餐无法删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }

            ids.forEach(setmealId->{
                //删除套餐表中的数据
                setmealMapper.deleteById(setmealId);
                //删除套餐菜品关系表中的数据
                setMealDishMapper.deleteBySetmealId(setmealId);
            });
        });
    }


    /*
     * 根据id查询套餐和关联菜品
     * */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        //查询套餐
        Setmeal setmeal = setmealMapper.getById(id);
        //查询套餐关联的菜品
        List<SetmealDish> setmealDishes=setMealDishMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal,setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }


    /*
     * 修改套餐
     * */
    @Override
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //1.修改套餐表
        setmealMapper.update(setmeal);


        //套餐id
        Long setmealId = setmealDTO.getId();
//        log.info("套餐id"+setmealId);
//        System.out.println("套餐id"+setmealId);

        //2.删除套餐和菜品的关联，
        setMealDishMapper.deleteBySetmealId(setmealId);

        //获取所有菜品
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish->{ //设置套餐的id
            setmealDish.setSetmealId(setmealId);
        });
//        log.info("套餐与菜品"+setmealDishes);
//        System.out.println("套餐与菜品"+setmealDishes);

        //3. 重新插入套餐和菜品的关联id
        setMealDishMapper.insertBatch(setmealDishes);

    }


    /*
     * 套餐起售停售
     * */
    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if(status==StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList=dishMapper.getBySetmealId(id);
            if(dishList!=null&&dishList.size()>0){
                dishList.forEach(dish->{

                    if(StatusConstant.DISABLE==dish.getStatus()){
                        //菜品有停售的
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        //重新构建套餐
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);  //然后再修改套餐信息
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}





